linux-kernel - Re: RE: very low IOPS due to "block: reduce kblockd_mod_delayed_work

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Date:   Tue, 28 Dec 2021 10:30:43 +0800
From:   Yin Fengwei <fengwei.yin@...el.com>
To:     Dexuan Cui <decui@...rosoft.com>, Jens Axboe <axboe@...nel.dk>,
        "Alex Xu (Hello71)" <alex_y_xu@...oo.ca>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "ming.lei@...hat.com" <ming.lei@...hat.com>,
        "hch@....de" <hch@....de>, Long Li <longli@...rosoft.com>,
        "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Sang, Oliver" <oliver.sang@...el.com>,
        "Li, Philip" <philip.li@...el.com>
Subject: Re: RE: very low IOPS due to "block: reduce
 kblockd_mod_delayed_work_on() CPU consumption"

Hi Jens, Dexuan,

On 12/20/2021 1:15 PM, Dexuan Cui wrote:
>> From: Jens Axboe <axboe@...nel.dk>
>> Sent: Sunday, December 19, 2021 7:28 AM
>>> ...
>>> Dexuan, can you test this for your test case too? I'm going to queue
>>> up a revert for -rc6 just in case.
>>
>> This one should be better...
>> ...
>> Jens Axboe
> 
> Hi Jens, sorry -- unluckily I lost the test environment.. :-(
> I pinged the user to set up the test environment again, but he's
> on vacation till the beginning of January.

We hit this issue in our testing env also and will help to verify
your fixing patch. Thanks.


Regards
Yin, Fengwei